US2849535A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Magnetic drum type telephone metering system
Assignee: British Telecommunications PLC
•
Filing: 1955-02-14
•
Granted: 1958-08-26
•
Expires: 1975-02-14
Abstract
No abstract record available.
Inventors
- 👤 Baker George Thomas
- 👤 Mann Victor Edmund
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 20:10
CPC Classifications
H; H04; H04M; H04M15/00; H04M15/04; H04Q; H04Q3/00; H04Q3/42
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US2513112A
Cited
US2594495A
Cited
US2587532A
Cited
US2614169A
Cited
US2679551A
Cited
US2700148A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1961-08-25 | 1962-02-24 | 1962-08-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1965-08-25 | 1966-02-24 | 1966-08-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1969-08-25 | 1970-02-24 | 1970-08-26 | $7700.00 | Window Closed / Lapsed |